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Jeff Bezos fires off a blue dart, singes Elon Musk and SpaceX

phuzz Silver badge

They've not released the figures yet (and they'll have to wait until a 100% thrust test to calculate them directly), but it's likely that the BE-4 will be somewhat more efficient than the F1-A (or the F1-B come to that).

Even a 5% improvement could save tons of mass in the first stage.

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